Javascript 如何在iframe中选择文档及其子元素
Google的recaptcha只是一个iframe，但在运行时它会扩展为一个嵌套在它下面的文档，如下所示Javascript 如何在iframe中选择文档及其子元素,javascript,jquery,Javascript,Jquery,Google的recaptcha只是一个iframe，但在运行时它会扩展为一个嵌套在它下面的文档，如下所示 <iframe src="https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LfkbSMUAAAAAHPAhDmPr5ZmSg0ijddy8kqz4WRP&co=aHR0cHM6Ly93d3cuYmF5bWFjay5jb206NDQz&hl=en&v=v152633
<iframe src="https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LfkbSMUAAAAAHPAhDmPr5ZmSg0ijddy8kqz4WRP&co=aHR0cHM6Ly93d3cuYmF5bWFjay5jb206NDQz&hl=en&v=v1526338122299&size=normal&cb=53001mhu4to3" width="304" height="78" role="presentation" frameborder="0" scrolling="no" sandbox="allow-forms allow-popups allow-same-origin allow-scripts allow-top-navigation allow-modals allow-popups-to-escape-sandbox"></iframe>
#文档
/*西里尔文字*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字体大小：400；
src:local（'Roboto-Regular'）、local（'Roboto-Regular'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOmCnqEu92Fr1Mu72xKKTU1Kvnz.woff2）格式（'woff2'）；
unicode范围：U+0460-052F、U+1C80-1C88、U+20B4、U+2DE0-2DFF、U+A640-A69F、U+FE2E-FE2F；
}
/*西里尔语*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字体大小：400；
src:local（'Roboto-Regular'）、local（'Roboto-Regular'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOmCnqEu92Fr1Mu5mxKKTU1Kvnz.woff2）格式（'woff2'）；
unicode范围：U+0400-045F、U+0490-0491、U+04B0-04B1、U+2116；
}
/*希腊分机*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字体大小：400；
src:local（'Roboto-Regular'）、local（'Roboto-Regular'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOmCnqEu92Fr1Mu7mxKKTU1Kvnz.woff2）格式（'woff2'）；
unicode范围：U+1F00-1FFF；
}
/*希腊语*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字体大小：400；
src:local（'Roboto-Regular'）、local（'Roboto-Regular'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOmCnqEu92Fr1Mu4WxKKTU1Kvnz.woff2）格式（'woff2'）；
unicode范围：U+0370-03FF；
}
/*越南人*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字体大小：400；
src:local（'Roboto-Regular'）、local（'Roboto-Regular'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOmCnqEu92Fr1Mu7WxKKTU1Kvnz.woff2）格式（'woff2'）；
unicode范围：U+0102-0103、U+0110-0111、U+1EA0-1EF9、U+20AB；
}
/*拉丁语系*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字体大小：400；
src:local（'Roboto-Regular'）、local（'Roboto-Regular'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOmCnqEu92Fr1Mu7GxKKTU1Kvnz.woff2）格式（'woff2'）；
unicode范围：U+0100-024F、U+0259、U+1E00-1EFF、U+2020、U+20A0-20AB、U+20AD-20CF、U+2113、U+2C60-2C7F、U+A720-A7FF；
}
/*拉丁语*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字体大小：400；
src:local（'Roboto-Regular'）、local（'Roboto-Regular'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2）格式（'woff2'）；
unicode范围：U+0000-00FF、U+0131、U+0152-0153、U+02BB-02BC、U+02C6、U+02DA、U+02DC、U+2000-206F、U+2074、U+20AC、U+2122、U+2191、U+2193、U+2212、U+2215、U+FEFF、U+FFFD；
}
/*西里尔文字*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：500；
src:local（'Roboto-Medium'）、local（'Roboto-Medium'）、url（//fonts.gstatic.com/s/Roboto/v18/kfolcnqeu92fr1mmeu9fcrc4amp6lbp.woff2）格式（'woff2'）；
unicode范围：U+0460-052F、U+1C80-1C88、U+20B4、U+2DE0-2DFF、U+A640-A69F、U+FE2E-FE2F；
}
/*西里尔语*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：500；
src:local（'Roboto-Medium'）、local（'Roboto-Medium'）、url（//fonts.gstatic.com/s/Roboto/v18/kfolcnqeu92fr1mmeu9fabc4amp6lbp.woff2）格式（'woff2'）；
unicode范围：U+0400-045F、U+0490-0491、U+04B0-04B1、U+2116；
}
/*希腊分机*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：500；
src:local（'Roboto-Medium'）、local（'Roboto-Medium'）、url（//fonts.gstatic.com/s/Roboto/v18/kfolcnqeu92fr1mmeu9fcbc4amp6lbp.woff2）格式（'woff2'）；
unicode范围：U+1F00-1FFF；
}
/*希腊语*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：500；
src:local（'Roboto-Medium'）、local（'Roboto-Medium'）、url（//fonts.gstatic.com/s/Roboto/v18/kfolcnqeu92fr1mmeu9fbxc4amp6lbp.woff2）格式（'woff2'）；
unicode范围：U+0370-03FF；
}
/*越南人*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：500；
src:local（'Roboto-Medium'）、local（'Roboto-Medium'）、url（//fonts.gstatic.com/s/Roboto/v18/kfolcnqeu92fr1mmeu9fcxc4amp6lbp.woff2）格式（'woff2'）；
unicode范围：U+0102-0103、U+0110-0111、U+1EA0-1EF9、U+20AB；
}
/*拉丁语系*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：500；
src:local（'Roboto-Medium'）、local（'Roboto-Medium'）、url（//fonts.gstatic.com/s/Roboto/v18/kfolcnqeu92fr1mmeu9fchc4amp6lbp.woff2）格式（'woff2'）；
unicode范围：U+0100-024F、U+0259、U+1E00-1EFF、U+2020、U+20A0-20AB、U+20AD-20CF、U+2113、U+2C60-2C7F、U+A720-A7FF；
}
/*拉丁语*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：500；
src:local（'Roboto-Medium'）、local（'Roboto-Medium'）、url（//fonts.gstatic.com/s/Roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2）格式（'woff2'）；
unicode范围：U+0000-00FF、U+0131、U+0152-0153、U+02BB-02BC、U+02C6、U+02DA、U+02DC、U+2000-206F、U+2074、U+20AC、U+2122、U+2191、U+2193、U+2212、U+2215、U+FEFF、U+FFFD；
}
/*西里尔文字*/
@字体{
字体系列：“Roboto”；
字体风格：普通；
字号：900；
src:local（'Roboto Black'）、local（'Roboto-Black'）、url（//fonts.gstatic.com/s/Roboto/v18/kfolcnqeu92fr1mmyutfcrc4amp6lbp.woff2）格式（'woff2'）；
unicode范围：U+0460-052F，U+
#document
<html dir="ltr" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<style type="text/css">
/* cyrillic-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto Regular'), local('Roboto-Regular'), url(//fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu72xKKTU1Kvnz.woff2) format('woff2');
unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
/* cyrillic */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto Regular'), local('Roboto-Regular'), url(//fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu5mxKKTU1Kvnz.woff2) format('woff2');
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* greek-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto Regular'), local('Roboto-Regular'), url(//fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu7mxKKTU1Kvnz.woff2) format('woff2');
unicode-range: U+1F00-1FFF;
}
/* greek */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto Regular'), local('Roboto-Regular'), url(//fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4WxKKTU1Kvnz.woff2) format('woff2');
unicode-range: U+0370-03FF;
}
/* vietnamese */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto Regular'), local('Roboto-Regular'), url(//fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu7WxKKTU1Kvnz.woff2) format('woff2');
unicode-range: U+0102-0103, U+0110-0111, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto Regular'), local('Roboto-Regular'), url(//fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu7GxKKTU1Kvnz.woff2) format('woff2');
unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto Regular'), local('Roboto-Regular'), url(//fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* cyrillic-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 500;
src: local('Roboto Medium'), local('Roboto-Medium'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fCRc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
/* cyrillic */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 500;
src: local('Roboto Medium'), local('Roboto-Medium'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fABc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* greek-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 500;
src: local('Roboto Medium'), local('Roboto-Medium'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fCBc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+1F00-1FFF;
}
/* greek */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 500;
src: local('Roboto Medium'), local('Roboto-Medium'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBxc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0370-03FF;
}
/* vietnamese */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 500;
src: local('Roboto Medium'), local('Roboto-Medium'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fCxc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0102-0103, U+0110-0111, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 500;
src: local('Roboto Medium'), local('Roboto-Medium'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fChc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 500;
src: local('Roboto Medium'), local('Roboto-Medium'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* cyrillic-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
src: local('Roboto Black'), local('Roboto-Black'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmYUtfCRc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
/* cyrillic */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
src: local('Roboto Black'), local('Roboto-Black'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmYUtfABc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* greek-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
src: local('Roboto Black'), local('Roboto-Black'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmYUtfCBc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+1F00-1FFF;
}
/* greek */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
src: local('Roboto Black'), local('Roboto-Black'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmYUtfBxc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0370-03FF;
}
/* vietnamese */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
src: local('Roboto Black'), local('Roboto-Black'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmYUtfCxc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0102-0103, U+0110-0111, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
src: local('Roboto Black'), local('Roboto-Black'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmYUtfChc4AMP6lbBP.woff2) format('woff2');
unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
src: local('Roboto Black'), local('Roboto-Black'), url(//fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmYUtfBBc4AMP6lQ.woff2) format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
</style>
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