- (void)webViewDidFinishLoad:(UIWebView *)webView {
[IDProgressHUD IDPlaceViewHideDirect:self.view]
//这里是js，主要目的实现对url的获取
static NSString * const jsGetImages =
@"function getImages(){\
var objs = document.getElementsByTagName(\"img\")\
var imgScr = ''\
for(var i=0i<objs.lengthi++){\
imgScr = imgScr + objs[i].src + '+'\
}\
return imgScr\
}"
[webView stringByEvaluatingJavaScriptFromString:jsGetImages]//注入js方法
NSString *urlResurlt = [webView stringByEvaluatingJavaScriptFromString:@"getImages()"]
mUrlArray = [NSMutableArray arrayWithArray:[urlResurlt componentsSeparatedByString:@"+"]]
if (mUrlArray.count >= 2) {
[mUrlArray removeLastObject]
}
//urlResurlt 就是获取到得所有图片的url的拼接；mUrlArray就是所有Url的数组
//添加图片可点击js
[mWebView stringByEvaluatingJavaScriptFromString:@"function registerImageClickAction(){\
var imgs=document.getElementsByTagName('img')\
var length=imgs.length\
for(var i=0i<lengthi++){\
img=imgs[i]\
img.onclick=function(){\
window.location.href='image-preview:'+this.src}\
}\
}"]
[mWebView stringByEvaluatingJavaScriptFromString:@"registerImageClickAction()"]
}
//在这个方法中捕获到图片的点击事件和被点击图片的url
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
//预览图片
if ([request.URL.scheme isEqualToString:@"image-preview"]) {
NSString* path = [request.URL.absoluteString substringFromIndex:[@"image-preview:" length]]
path = [path stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]
//path 就是被点击图片的url
return NO
}
return YES
}
==========================================js 中读取JSON的方法探讨
js读取JSON的方法我接触到的有两种：
方法一：函数构造定义法返回
var strJSON = "{name:'json name'}"//得到的JSON
var obj = new Function("return" + strJSON)()//转换后的JSON对象
alert(obj.name)//json name
方法二：js中著名的eval函数
var strJSON = "{name:'json name'}"//得到的JSON
var obj = eval( "(" + strJSON + ")" )//转换后的JSON对象
alert(obj.name)//json name
第二种方法需要注意的是，对象表达式{'name':'json name'}必须用“（）”扩住，否则
var strJSON = "{name:'json name'}"
var obj = eval(strJSON)
alert(obj.constructor)//String 构造函数
alert(obj.name)//undefine
必须把对象表达式扩起来eval执行才能生成一个匿名对象!
