JSON使用和类型转化问题 

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<title>JSON对象和字符串的转化</title>
<script type="text/javascript">
    //1.json字符串转成对象[取值方便]
    console.log('1.json字符串转成对象');
    var str1='{"firstName":"hr","lastName":"w"}';
   //通过调用对象的属性获取值
    var JsonObj1=JSON.parse(str1);//把字符串转成对象数组
    console.log(str1);
    console.log(JsonObj1.firstName);
    console.log(JsonObj1.lastName);
    //2.json对象转成字符串
    console.log('-----------------');
    console.log('2.json对象转成字符串');
    var str2=JSON.stringify(JsonObj1);
    console.log('str2'+str2);
    //3.遍历数组json
    var str3='[{"firstName":"hr","lastName":"w"},{"firstName":"jp","lastName":"x"},{"firstName":"Bill","lastName":"Gates"}]';
    //把字符串转成对象
    var persons=JSON.parse(str3);
    console.log('persons.length:'+persons.length);
    for(var i=0;i<persons.length;i++){
    	console.log(persons[i].lastName);
    }
</script>
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posted @ 2020-01-13 17:50  maskpd  阅读(251)  评论(0)  编辑  收藏  举报