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JavaScript loop statement ---------------- while LOOP statement.
When the loop condition is true, the loop continues until the loop condition is false.
The template is as follows:
<HTML><HEAD><TITLE>Hello World</TITLE></HEAD><BODY BGCOLOR="WHITE"><SCRIPT Language="JavaScript" TYPE="text/javascript">var value=10;while(value>1){document.write(value+"<br>");value--;}</SCRIPT></BODY></HTML>
The preceding while LOOP statement first checks whether the condition is true and then executes the statement. Next let's take a look at the first execution and then judgment, that is, at least one loop body ---------- do... while () loop statement:
<HTML><HEAD><TITLE>Hello World</TITLE></HEAD><BODY BGCOLOR="WHITE"><SCRIPT Language="JavaScript" TYPE="text/javascript">var value=10;do{document.write(value+"<br>");}while(value>20);</SCRIPT></BODY></HTML>
The break statement and the continue statement in the loop statement.
The break statement is used to terminate the loop statement and exit the loop. The continue statement is used to skip the current loop (the code block under the continue statement) and directly execute the next loop body.
Break statement:
<HTML><HEAD><TITLE>Hello World</TITLE></HEAD><BODY BGCOLOR="WHITE"><SCRIPT Language="JavaScript" TYPE="text/javascript">var value=10;for(var i=0;i<10;i++){if(i==5){break;}document.write(value+"<br>");value--;}</SCRIPT></BODY></HTML>
<HTML><HEAD><TITLE>Hello World</TITLE></HEAD><BODY BGCOLOR="WHITE"><SCRIPT Language="JavaScript" TYPE="text/javascript">var value=10;for(var i=0;i<10;i++){if(i==5){break;}document.write(value+"<br>");value--;}</SCRIPT></BODY></HTML>
Code Description: terminate when I is equal to 5 and jump out of the loop body.
Continue statement:
<HTML><HEAD><TITLE>Hello World</TITLE></HEAD><BODY BGCOLOR="WHITE"><SCRIPT Language="JavaScript" TYPE="text/javascript">for(var value=0;value<10;value++){if(value==5){continue;}document.write(value+"<br>");}</SCRIPT></BODY></HTML>
<HTML><HEAD><TITLE>Hello World</TITLE></HEAD><BODY BGCOLOR="WHITE"><SCRIPT Language="JavaScript" TYPE="text/javascript">var value=-1;while(value<9){value++;if(value==5){continue;}document.write(value+"<br>");}</SCRIPT></BODY></HTML>
Code Description: When I is equal to 5, it is terminated and the loop body after the current continue is skipped once before execution.
Reprinted please indicate the source: http://blog.csdn.net/hai_qing_xu_kong/article/details/41385641 sentiment control _
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