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分享JS跨域获取图片地址
QQ登录的地址：
https://ui.ptlogin2.qq.com/cgi-bin/login?style=8&appid=523005422&s_url=https%3A%2F%2Faq.qq.com%2Fcn2%2Fmobile_index&low_login=0&hln_css=https%3A%2F%2Faq.qq.com%2Fv2%2Fimages%2Flogo_new.png&hln_custompage=1
我想取出他的验证码地址：https://ssl.captcha.qq.com/cap_union_new_getcapbysig?aid=523005422&captype=&protocol=https&clientype=1&disturblevel=&apptype=2&noheader=0&color=&showtype=&fb=1&theme=&lang=2052&ua=TW96aWxsYS81LjAgKFdpbmRvd3MgTlQgNS4xKSBBcHBsZVdlYktpdC81MzcuMzYgKEtIVE1MLCBsaWtlIEdlY2tvKSBDaHJvbWUvNTUuMC4yODgzLjg3IFNhZmFyaS81MzcuMzY=&sess=nTmej9L2fJr2ZcieeZvXhUykNclFdqOKNWKEC0ny7uTz9Gwi_0bDIMODs1geoCYeSaNkOVLF1gkPLfnzdlu0HvJLjn1GheRNl62fMzUbZwUB-jffJQUkW4YIUbSWlTStslfrTtIQQ0zn_TKlAIBAaEqoxU4M759-FDC-vRVWDzJdoj1IqzJgC6ZxJpaBi_M_bJxTRDaxsZc*&fwidth=0&sid=6516834840410088382&uid=345345435&cap_cd=B0VCvm90q0qZF3J7M5HT5Tx2wvbtW-_knxnygwpty1Wf5lex-TTf8g**&rnd=901340&forcestyle=undefined&rand=0.66069111639163&vsig=c01UT-0Az0QssgUUDaOMZZIzkhgbLVmhQBrnQS1dgboRHMFRPa4-3pHzOo2cCLDoMjx4ea1GNqJE8PFLwzBc2UM0laOky5qAl5OmAzwKbOdoVqiLTaBdbI3tHhP82AA-zGvkuYBB3B1xhce4yKeRmPjSBPpAyJAnEoLC0E4gVZX1FhVoQeyAxlaWg**&img_index=1
我现在是这样的：document.getElementById("tcaptcha_iframe").contentWindow.document.getElementById("bkBlock").src;
但是提示：VM560:2 Uncaught DOMException: Blocked a frame with origin "https://ui.ptlogin2.qq.com" from accessing a cross-origin frame.这个错误，应该是跨域问题，不知道怎么解决。
https://ui.ptlogin2.qq.com/cgi-bin/login?style=8&appid=523005422&s_url=https%3A%2F%2Faq.qq.com%2Fcn2%2Fmobile_index&low_login=0&hln_css=https%3A%2F%2Faq.qq.com%2Fv2%2Fimages%2Flogo_new.png&hln_custompage=1
我想取出他的验证码地址：https://ssl.captcha.qq.com/cap_union_new_getcapbysig?aid=523005422&captype=&protocol=https&clientype=1&disturblevel=&apptype=2&noheader=0&color=&showtype=&fb=1&theme=&lang=2052&ua=TW96aWxsYS81LjAgKFdpbmRvd3MgTlQgNS4xKSBBcHBsZVdlYktpdC81MzcuMzYgKEtIVE1MLCBsaWtlIEdlY2tvKSBDaHJvbWUvNTUuMC4yODgzLjg3IFNhZmFyaS81MzcuMzY=&sess=nTmej9L2fJr2ZcieeZvXhUykNclFdqOKNWKEC0ny7uTz9Gwi_0bDIMODs1geoCYeSaNkOVLF1gkPLfnzdlu0HvJLjn1GheRNl62fMzUbZwUB-jffJQUkW4YIUbSWlTStslfrTtIQQ0zn_TKlAIBAaEqoxU4M759-FDC-vRVWDzJdoj1IqzJgC6ZxJpaBi_M_bJxTRDaxsZc*&fwidth=0&sid=6516834840410088382&uid=345345435&cap_cd=B0VCvm90q0qZF3J7M5HT5Tx2wvbtW-_knxnygwpty1Wf5lex-TTf8g**&rnd=901340&forcestyle=undefined&rand=0.66069111639163&vsig=c01UT-0Az0QssgUUDaOMZZIzkhgbLVmhQBrnQS1dgboRHMFRPa4-3pHzOo2cCLDoMjx4ea1GNqJE8PFLwzBc2UM0laOky5qAl5OmAzwKbOdoVqiLTaBdbI3tHhP82AA-zGvkuYBB3B1xhce4yKeRmPjSBPpAyJAnEoLC0E4gVZX1FhVoQeyAxlaWg**&img_index=1
我现在是这样的：document.getElementById("tcaptcha_iframe").contentWindow.document.getElementById("bkBlock").src;
但是提示：VM560:2 Uncaught DOMException: Blocked a frame with origin "https://ui.ptlogin2.qq.com" from accessing a cross-origin frame.这个错误，应该是跨域问题，不知道怎么解决。
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FeeLinear_iiiiiiiiii 2018-02-23
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看这样子楼主想搞事情啊
周慧雨 2018-02-22
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楼上正解 前端没办法搞的
似梦飞花 2018-01-31
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跨域了 对方不配合没办法 让后端帮忙搞下吧
