eval("3+2")//5

eval();全局eval();严格eval()

函数和可执行的对象(callable object)

delete一元操作符,善处对象属性或者数组元素,用来做删除操作,不是用来返回一个值得;内置核心和客户端属性是不能删除的,用户通过var语句声明的变量不能删除,通过function语句定义的函数和函数参数也不能删除。

SyntaxError语法错误当delete的操作数是一个属性访问表达式时才正常工作。

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" alt="" />

语句

表达式语句(函数调用是表达式语句的另一大类),声明语句,控制结构

复合语句compound statement

function convert(x){
alert(0);
switch(typeof x){ case 'number':alert(1);
alert(2);
return x.toString(16);
alert(3);
case 'string':
alert(4);
return '"'+x+'"';
alert(5);
default:
alert(6);
return String(x);
alert(7);
}
}
console.log(convert('6'))

异常,捕获异常

outerloop:

        for(i=0;i<10;i++){
alert(1);
innerloop:
// alert(2);
for(j=0;j<10;j++){
alert(3);
if(j>3){break;}
alert(4);
if(i==2){break innerloop;}
alert(5);
if(i==4){break outerloop;}
alert(6);
document.write("i="+i+",j="+j+"<br/>");
alert(7);
}
alert(8);
}
alert(9);
document.write("final"+"i="+i+",j="+j);
alert(10);

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