Html Episode 7: debugger debugging, Json

Please indicate the source of the reprint: http://blog.csdn.net/zhaoyanjun6/article/details/126524473
This article comes from [Zhao Yanjun's blog]

debugger

The debugger keyword is used to stop JavaScript execution and call a debug function.

This keyword has the same effect as setting a breakpoint in a debugging tool.

The debugger statement will not work if no debugger is available.

With the debugger enabled, the code stops executing before the third line.

Example:

var x = 15 * 5;
debugger;
document.getElementbyId("demo").innerHTML = x;

Turn on debug mode

add breakpoint

Open the control panel, clickSources

JSON

script>

    //定义对象
    user = {
    
    "name": "zhaoyanjun", "age": 20, "man": false}

    function aa() {
    
    
        console.log("json " + user.name + " " + user.age)

        //把对象转换为 json 字符串
        const jsonString = JSON.stringify(user)
        console.log("json " + jsonString)

        //把json 字符串转换成对象
        const user2 = JSON.parse(jsonString)
        console.log("json " + user2.name)
       
    }

</script>

The effect is as follows:

• traverse all keys

//遍历所有Json key
for (const user2Key in user) {
    
    
   console.log("json key " + user2Key)
}

• create json string

const json = JSON.stringify({
    
    color: 1, size: 100})
console.log(json)