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"use strict"

"use strict";
//严格模式
<!doctype html><html><head><meta charset="utf-8"><title>无标题文档</title></head><body><script>"use strict";(function() {       var a = b = 5;})();
//这个会报错哦;console.log(b);</script></body></html>

<!doctype html><html><head><meta charset="utf-8"><title>无标题文档</title></head><body><script>(function() {       var a = b = 5;})();
//这个居然跑出来一个5,尼玛!!console.log(b);</script></body></html>

  

"use strict"